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 - Generate a JS module for cr/ui/tabs.js. In order to do so
   changing cr.defineProperty() to Object.defineProperty() as
   done for other cr.ui elements as part of crbug.com/1133198
 - Include tabs.m.js, tree.m.js and ui.m.js in Desktop builds.
 - Fix getPropertyDescriptor() signature in cr.m.js to address
   JS compiler errors when used from tabs.m.js.
 - Update chrome://quota-internals to use the module versions of
   its dependencies.

Bug: 1028829
Change-Id: Icf6576d4111f7bc7481b1a105b80d76ebe4d91d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2478887
Commit-Queue: dpapad <dpapad@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818839}